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Why the blue colour of CuSO4 turns colourless during electrolysis of CuSO4 solution by platinum electrode.

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The platinum electrodes are inert. Hence does not dissolve into the solution. The Cu++ ions (blue) present in the solution are discharged on the surface of cathode & OH – are discharged on the surface of anode while H+ and SO4 2- ions remains in the solution. As a result of this electrolysis, blue coloured CuSO4 solution is slowly converted into colorless H2SO4 solution.

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